svelte-jsx and svelte-shims are used for Svelte 3 only, and are likely out of date, yet we don't want to invest time into adjusting them anymore, therefore silence any type errors in it.
Helps with #2498

…ject (#2488)

Fixes #2486
Fixes #2485

There were reports that this was too overzealous as some people use this potentially not knowing whether or not this is a Svelte-projects, too. Therefore only issue a warning instead of an error.

This reverts commit 8c080cf.

This reverts #2477. Sadly, the idea didn't work out, as shown by two opened bug reports:

- #2506: A type union can be narrowed on the input, but not on the way back out
- #2494: A generic nested within a bound value is not properly resolved and not falling back to `any` (in #2477 we thought of the generic case, but only for when the generic is the whole value type, not when it's nested)

For these reasons I don't see a way to properly implement #1392 at the moment.

#2464

getPackageJsonsVisibleToFile and getGlobalTypingsCacheLocation are singleton so this should definitely be fine. The proxy language service has the exact list of entry files and the auto-typing also doesn't add any export so it should be fine to just proxy these methods.

…de (#2517)

When a component is in runes mode and not using slots or events, adjust the output to only create the function type that mimics the underlying real shape of components in Svelte 5. This is a breaking change because previously the type was enhanced such that it also had the legacy class shape. As a result, users now may need to switch to `typeof Component` when using the component inside types.

Sadly, due to a combination of requirements and TypeScript limitations, we need to always create both a legacy class component and function component type.
 - Constraints: Need to support Svelte 4 class component types, therefore we need to use __sveltets_2_ensureComponent to transform function components to classes
- Limitations: TypeScript is not able to preserve generics during said transformation (i.e. there's no way to express keeping the generic etc)

TODO Svelte 6/7: Switch this around and not use new Component in svelte2tsx anymore, which means we can remove the legacy class component. We need something like _ensureFnComponent then.

…rvice (#2518)

#2516

Most of the time, the didOpen request is earlier than the watcher event. So if the file doesn't exist in the GlobalSnapshotManager we manually invoke the project file update check. This won't cause 2 project files check because if the file already is a project file we won't check project files.

Also remove long-obsolete sapper handling